Peel cucumber and discard skin. Continue using peeler, making long, lengthwise cuts to make ‘noodles’. Peel, rotating cucumber until you reach the core of seeds. Discard seeds. Drain noodles in a colander while preparing dressing. Whisk all other ingredients together. Squeeze noodles to get rid of excess moisture. Toss with dressing and garnish with sesame seeds. Serve immediately.